4" x 40" | CTA Commercial Reverse Osmosis RO Membrane | Chlorine Tolerant | Applied Membranes

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4" x 40"  CTA Chlorine Tolerant Reverse Osmosis Membrane for Commercial RO System

Applied Membranes (AMI) Commercial CTA RO Membranes Remove up to 96% of total dissolved solids and feature a Chlorine Tolerance of 0.3 to 0.5 ppm.   

With hundreds of thousands of membranes in operation in water filtration systems world-wide, AMI membranes have earned a reputation of delivering consistent, reliable, and long lasting  performance, making AMI Membranes the natural choice for use in small commercial RO systems.  AMI Small Commercial CTA RO Membranes are constructed of CTA (Cellulose Triacetate) membrane material and fit standard PVC and Stainless Steel RO Membrane Housings. 

AMI Membranes are Made in the USA in their ISO 9001:2015 Certified Facility and are 100% Quality and Performance Tested.

Genuine AMI Membranes ISO USA Quality

Features of Applied Membranes Commercial CTA RO Membranes

  • Chlorine Tolerant
  • Made in the USA
  • Manufactured in our ISO 9001:2015 Certified Facilities
  • 100% Performance and Quality Tested
  • Backed by our Experienced Technical Support Staff
  • High Quality for Consistent and Reliable Performance
  • Standard dimensions to fit in commonly available housings



Specifications for M-C4040A

Part Number: M-C4040A
Membrane Size (Nominal): 4 x 40
Membrane Dimensions: 3.9"Dia. x 40"L
Flow Rate: 1,000 GPD (3,785 LPD)
Applied Pressure: 225 psi (1.6 MPa)
Stabilized Salt Rejection: 96%
For Housing: Standard 4" x 40"
Outer Wrap: Tape Wrapped
Membrane Sheet: CTA (Cellulose Triacetate)
Element Type: Spiral Wound
Feed Water Test Temperature: 77°F  (25°C)
Single Element Recovery: 15%
Chlorine Tolerance: 0.3-0.5 ppm
(1 ppm maximum)
Feed water pH Range: 4-6 (continuous)
Cleaning pH Range: 3-8 (30 minutes)
Maximum Operating Pressure: 300 psig (2.1 MPa)
Maximum Operating Temperature: 104°F (40°C)
Maximum Feed Water Turbidity: 1 NTU
Maximum Feed Water SDI (15 min): 4
Maximum Pressure Drop: 13 psig (0.9 bar)
Maximum Feed Flow: 17 gpm
Minimum Brine to Feed Flow Ratio: 5:1
End Style: Male PWT (Stinger Style)
Manufacturer: Applied Membranes, Inc.
Country of Manufacture: United States (USA)

AMI Membranes Product Specifications

Note: Performance specifications based on 500 ppm tap water, 225 psi (1.6 MPa) applied pressure, 77ºF (25ºC) feed water temperature, and the recovery listed in the table above. Element permeate flow may vary ± 20%.

Applications for AMI Commercial RO CTA Membranes

  • Restaurants
  • Whole House (Residential)
  • Office
  • Institutions
  • Hotels
  • Hospitals
  • Disaster Relief
  • Spot Free Rinse/Car Wash
  • Labs
  • Pharmaceutical
  • Humidification
  • Misting
  • Manufacturing
  • Rinse Water
  • Bottled Water
  • Water stores
  • Beverage
  • Food Processing
  • Ice Makers
  • Commercial Water Treatment
  • Ice Makers
  • Tap Water
  • Wide Variety of Other Applications

Physical Dimensions of M-C4040A:


Total Length (L):

40 In. (101.6 cm)

Membrane Length (I):

38 In. (96 cm)

Diameter (D):

3.9 In. (9.9 cm)

PWT (P):

0.75 In. (1.9 cm)


Replacement Compatibility for AMI  4 X 40 CTA RO MEMBRANES

Applied Membranes M-C4040A membrane elements fit industry-standard 4x40 membrane housing pressure vessels and can be used as direct replacement for many industry-standard 4x40 size CTA RO elements with 3/4" male product water tubes ("stinger style").